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Induction Motor

Three phase induction motors have a very simple construction made up of a stator protected with electromagnets, and a rotor composed of conductors shorted at each end, arranged as a “squirrel cage”. They focus on the principle of induction in which a rotating electro-magnetic field it made by applying a three-phase current at the stators electromagnets. This in turn induces a current inside the rotor’s conductors, which in turns generates rotor’s magnetic field that tries to check out stator’s magnetic field, pulling the rotor into rotation.

Benefits of AC Induction Motors are:

Induction motors are basic and rugged in structure. They are better quality and can operate in virtually any environmental condition

Induction motors are cheaper in cost due to simple rotor construction, lack of brushes, commutators, and slide rings

They are free of maintenance motors unlike dc motors due to the absence of brushes, commutators and slip rings

Induction motors could be operated in polluted and explosive conditions as they do not have brushes that may cause sparks

AC Induction motors are Asynchronous Devices and therefore the rotor will not change at the precise same speed because the stator’s rotating magnetic field. Some difference in the rotor and stator rate is necessary to be able to produce the induction into the rotor. The difference between the two is named the slip. Slip must be kept within an optimal range in order for the motor to operate effectively. Roboteq AC Induction controllers can be configured to operate in another of three modes:

Scallar (or Volts per Hertz): an Open loop mode in which a order causes a simultaneous, fixed-ratio Frequency and Voltage change.

Controlled Slip: a Closed Loop speed where voltage and frequency are managed in order to keep slip within a narrow range while working at a preferred speed.

Field Oriented Induction Motor control (Vector Drive): a Closed Loop Velocity and Torque control that functions by optimizing the rotating field of the stator vs. this of the induced field in the rotor.

Observe this video from Learning Engineering for a visual illustration on how AC Induction Motors are constructed and function.

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